Method swap

src/data-structures/heap/Heap.js:97–101

* @param {number} indexOne * @param {number} indexTwo

(indexOne, indexTwo)

   * @param {number} indexTwo
   */
  swap(indexOne, indexTwo) {
    const tmp = this.heapContainer[indexTwo];
    this.heapContainer[indexTwo] = this.heapContainer[indexOne];
    this.heapContainer[indexOne] = tmp;
  }

  /**
   * @return {*}